TELEFUKEN RS5 VALVE, 1918
The R.S.5. was an RS4 with improved performance being produced at a rate of 25 per day in 1918.
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It operated with a filament current 3 amps from 8 to 12 volts depending on the valve, with 400 volts on the anode the output was 5 watts, with 600-800 volts it could be 10 to 20 watts.the valve was also made by Siemens and Halske, the glass work inside is of an excellent type.
The valve is designed for possible oil immersion to facilitate cooling.